sit out

1.  Also, sit through. Stay until the end of, as in We decided to sit out the lecture instead of leaving early, or He was only eight when he sat through an entire opera--and it lasted nearly five hours. [Early 1700s]
2.  Refrain from taking part in, as in Jane's foot hurt so she sat out the last three dances. [Mid-1600s]
3.  Outlast, outstay, as in He sat out all the other guests, hoping to get a word alone with the host. [Mid-1700s]

The verb has 2 meanings:

Meaning #1: not participate in (an activity, such as a dance or a sports event)

Meaning #2: endure to the end